You need a mapper that maps communication from a TCP/IP port to the klipper pipe. I think socat would be able to do so.
socat TCP-LISTEN:8888,fork,reuseaddr FILE:/dev/pts/1,b57600,rawwould map /dev/pts/1 to port 8888. I think this version even survices reconnects,
With that installed on the klipper PCs you can connect Repetier-Server to that tcp port instead of serial.
This solution has one drawback - the network connection must be ultra stable so best use ethernet and not wifi! This also improves speed as you already get extra delays from network to klipper. That is main reason you normally pur server on same pi as klipper to have no network issues. You could then use Repetier-Server Monitor to show both in one ui.
